$OpenBSD: patch-principal_c,v 1.1 2016/10/20 20:25:19 jturner Exp $
--- principal.c.orig	Thu Oct 20 16:22:37 2016
+++ principal.c	Thu Oct 20 16:22:45 2016
@@ -17,6 +17,7 @@
 #include "config.h"
 
 #include <assert.h>
+#include <stdarg.h>
 #include <stdint.h>
 #include <stdlib.h>
 
